Did you know that Chapters Indigo have a costume store online? If you're starting to rack your brains to think of a cool costume for your littl'un, then you could have a browse there. As a pre-Halloween sale, they're offering up to 50% discount on their costumes.
From what I can see, they have all sorts of scary Halloween costumes, from devils to doctors! The online prices seem really reasonable, with outfits starting at $9.98, and accessories starting from $3.98.
As it is Chapters, if you are spending less than $39, you would pay extra for shipping. But it's really easy to throw a few books or DVDs in your cart which you have been hankering after, just to take the minimum spend up to that tier.